a joyful crowd dancing in the stadium as president obama honored the legacy. our reporter has more on the celebration for a man who changed the world. >> the world descended on johannesburg to celebrate the life of nelson mandela. tens thousands singing and dancing in a downpour. that is a sign in after a. >> when it rains it means your goals are welcoming you. >> four united states presidents, obama, bush, chip ton -- clinton and carter, joins 94,000 in the soccer. president obama greeted cuban leader raul castro, coming together to honor the man that south africa called madiba. and madiba would give voice to the claims of the oppressed like martin luther king. >> his lifelong fight for freedom is remembered through song. ♪ madiba >> and prayer. >> we beseech you in your great loving kindness, the soul of nelson mandela. >> three of his grandchild took the stage. amen, women, and children side-by-side, dreaming the same dream. >> residents of his home village watched the memorial live on tv. the former president will be buried there on sunday. >> before tha